Back when i was playing Red, when you bought the game, a little packet would be included explaining the controls, the game, and the story. Well in the middle it hinted that there were rare Pokemon in the game, ones that you only have one chance to catch.
And i was thinking "Wow! only one shot?"
Back then, first time playing the game, i didn't know any of the Pokemon. I remember going to the Power Plant, didn't know about Zapdos or legendary birds, i just went there after I had beaten Koga and could swim. So i go and i see Magnemite, Voltorb; Pokemon I've seen before in battle.
But then i come across and Electabuzz.....
I thought it was Legendary, I've never seen it before, and it looked powerful [compared to a Voltorb] and i try to catch it, but i accidentally Poison it and it dies.....
one shot and i blew it!!!
so i reset the game.
later i found out from a friend about the Legendary birds and everything else.
[sigh]